<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="allComplate" />
    </label>
    <span>
      <span>已完成{{ complateNum }}</span> / 全部{{ todoList.length }}
    </span>
    <button class="btn btn-danger" @click="emits('deleteAllComplate')">清除已完成任务</button>
  </div>

</template>

<script lang="ts">
import { defineComponent } from "vue";

export default defineComponent({
  name: "Footer",
});
</script>

<script setup lang="ts">
  import { computed } from 'vue'
  import type { todoListType } from '../../App.vue';

  // 接收App组件传递过来的props
  const props = defineProps<{
    todoList:todoListType;
  }>()

  // 接收App组件传递过来的自定义事件
  const emits = defineEmits<{
    (event:"allComplate",type:boolean):void;
    (event:"deleteAllComplate"):void;
  }>()

  // 已完成的数量
  const complateNum = computed(() => {
    return props.todoList.reduce((p,c) => (c.done ? p + 1 : p),0)
  })

  // 全选按钮逻辑
  const allComplate = computed({
    get(){
      return (
        props.todoList.every((item)=>(item.done)) && props.todoList.length !== 0
      )
    },
    set(value:boolean){
      emits("allComplate",value)
    }
  })
</script>

<style  scoped lang="scss">
  /*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}

</style>